Almost there. Ask yourself why did he omit that? He already admits to the Uchiha massacre and that he had a grudge against the Leaf, so he isn't worried about retribution from Sasuke. What does that leave?
Well... actually if he admits that he was behind the attack, Sasuke would go against him because basically it will prove everyone's beliefs that it was the Uchihas behind the attack and Konoha were somewhat right to hold a grunge against the Uchihas and thus making Itachi's decision to extinguish them all, right?
And I know that Sasuke is there a tool. But a tool for what? I keep seeing everyone going around him... but why?
Who are "them" the persons to which Sasuke is heading.
Who would Madara trust so much rather than his own brother.
How long did he survive? At least i established that the fight with Onoiki was while Hashirama was still alive, he was a kage. So a timeline problem in minus.
But what happened to Madara between these over 80 years ago and the time he died for real? I think Madara's connection to Orochimaru is bigger than I thought at the beginning. Because Orochimaru in season 1 of Naruto came right after him, precise target.
As well, Madara trusting Orochimaru when his after the Uchiha body? This doesn't match either.
God, so many questions.
I started reading the manga to find some answers, and actually brought me more questions than answers...